KR20120070522A - Component mounting apparatus - Google Patents

Abstract

PURPOSE: A component mounting apparatus is provided to increase the lifetime of components in a corresponding holding unit by preventing a large bending moment in both holding units of a movable beam. CONSTITUTION: A transfer rail transfers a circuit board in an X direction. A mount head(12) is mounted on a movable beam(13) extended in the X direction. The mounting head absorbs electronic components by an absorbing nozzle(12b) installed in the lower side of the leading end of a unit mounting head(12a). Frames(14a,14b) extended in a Y direction are installed in left and right sides of a base(10) in the X direction. A Y operating device(30,40) is installed in the frame to move along the frame.

Description

Component Mounting Device {COMPONENT MOUNTING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting apparatus for mounting a component supplied from a component supply apparatus on a substrate, and more particularly, to a linear motion mechanism for linearly driving a moving beam on which a mounting head is mounted.

As a linear motion mechanism of the conventional component mounting apparatus, there exists a technique of patent document 1, for example. This technique relates to the Y linear drive mechanism which linearly drives the moving beam in which the mounting head of a component is mounted to a Y direction with a linear motor. The said Y linear motion mechanism guides both ends of a moving beam to a Y direction by the guide mechanism which combined the guide rail and the slider. 7 is a front view showing a Y linear motion mechanism of a conventional component mounting apparatus. In FIG. 7, the horizontal direction is the X direction, and the paper vertical direction is the Y direction.

Frames 102 and 103 extending along the Y direction are provided at the left end and the right end in the X direction on the device base 101. The frames 102 and 103 are provided with Y linear motion mechanisms 110 and 120, respectively, and by these Y linear motion mechanisms 110 and 120, both ends of the moving beam 104 which extend in the X direction are present. Then, the moving beam 104 is moved in the Y direction.

The Y linear motion mechanism 110 includes the plate 111 fixed to the lower surface of the left end of the moving beam 104 in the X direction, the linear motor mover 112 fixed to the lower surface of the plate 111, and the frame 102. The linear motor stator 113 fixed to be disposed to face the linear motor mover 112 on the upper surface, two sliders 114 fixed to the lower surface of the plate 111, and the upper surface of the frame 102 and Y direction It consists of two guide rails 115 extending to exist. The slider 114 is slidably fitted to the guide rail 115, and when driving the linear motors 112 and 113, the left end of the moving beam 104 in the X direction is the slider 114 and the guide. Guided in the Y direction by the rail 115.

The Y linear motion mechanism 120 includes a plate 121 fixed to the side of the right end of the moving beam 104 in the X direction, a linear motor mover 122 fixed to the right side of the plate 121 in the X direction, and a frame ( A linear motor stator 123 fixed to the left side in the X direction of the 103 in a direction opposite to the linear motor mover 122, two sliders 124 fixed to the right side in the X direction of the plate 121, and a frame. It is comprised by the two guide rails 125 which are fixed to the left side of the X direction of 103, and extend in the Y direction. The slider 124 is slidably fitted to the guide rail 125, and when the linear motors 122 and 123 are driven, the right end in the X direction of the moving beam 104 is the slider 124 and the guide. Guided in the Y direction by the rail 125. In addition, the moving beam 104 incorporates an X linear motion mechanism (not shown) which is driven by a linear motor similarly to the Y linear motion mechanisms 110 and 120. Then, by driving the X linear motion mechanism, the mounting head 105 is moved along the moving beam 104 in the X direction.

Japanese Patent Publication No. 4207833

The linear motion mechanism using the linear motor is characterized by high speed operation and high positional accuracy, and the moving beam and the mounting head driven by the linear motor perform high-speed start and stop at high frequency. . When the linear motor is driven, the mover generates heat, and the heat is transmitted to the moving beam, causing the moving beam to expand and contract or bend in the X direction. In the conventional linear motion mechanism of the component mounting apparatus, both ends of the moving beam are guided by the guide mechanism combining the slider and the guide rail, and there is no freedom in the X direction of the moving beam. For this reason, when the heat deformation of the moving beam occurs, a large bending moment acts on the guide mechanism. For example, in FIG. 7, when the moving beam 104 expands and contracts in the X direction (plane left and right directions), in particular, the slider 114 and the guide rail of the Y linear motion mechanism 110 which keeps the end of the moving beam in a horizontal posture ( There is a large load on 115). As described above, this phenomenon occurs at high frequency because the moving beam and the mounting head perform high starting and stopping at high acceleration.

In this manner, high loads acting on the guide mechanism cause a reduction in the life of the parts constituting the guide mechanism. In addition, the deformation of the moving beam may cause a deterioration in the mounting accuracy of the electronic component. Accordingly, an object of the present invention is to provide a component mounting apparatus capable of realizing extension of component life and prevention of deterioration of component mounting accuracy in a linear motion mechanism using a linear motor.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the component mounting apparatus which concerns on Claim 1 is a component mounting apparatus which mounts a component in the predetermined position of a board | substrate by the adsorption nozzle of a mounting head, The said mounting head is mounted and a 1st direction is mounted on an apparatus base. And a moving beam extending in a second direction perpendicular to the first direction, a linear motor for moving the moving beam in the first direction, and one end of the moving beam. A first holding part for holding the base so as to be movable in the first direction, and a second holding part for holding the other end of the moving beam to be movable in the first direction with respect to the device base; The first holding part is fixed to the device base and extends in the first direction, and is fixed to one end of the moving beam. And a guide mechanism having a slider that is slidably fitted to the guide rail, wherein the second retaining portion is pivotally connected to the other end of the moving beam in alignment with the second direction and at the same time; And a rolling mechanism mounted on the device base so as to be slidable in two directions.

In this way, one end of the moving beam is held constrained by the guide mechanism and the other end is held by the rolling mechanism mounted on the device base so as to be slidable in the second direction. For this reason, the freedom degree of a 2nd direction can be provided to a moving beam. Therefore, when the moving beam is stretched or bent in the second direction due to the heat generated by the linear motor, the second holding part slides in the second direction to absorb the stretching or bending, and thus the large bending part in the first holding part and the second holding part is large. The moment can be suppressed from being loaded. As a result, it is possible to suppress the deterioration of the life of components of the first holding part and the second holding part. Furthermore, by providing the moving beam with a degree of freedom in the second direction, even if thermal deformation occurs in the moving beam, it can be eliminated. For this reason, the deterioration of the mounting precision of the electronic component due to the deformation of the moving beam can be prevented, and the mounting precision can be stabilized.

In the component mounting apparatus according to claim 2, in the invention according to claim 1, the rolling mechanism is configured such that the inner ring is fixed to the other end of the moving beam with the inner line coinciding with the second direction, and the outer ring rotates. It is characterized by consisting of a rolling bearing possible. As a result, the rolling mechanism can be realized with a relatively simple configuration. Furthermore, the component mounting apparatus according to claim 3 is, in the invention according to claim 1, wherein the rolling mechanism is constituted by a cylindrical roller which is axially aligned with the second direction and rotatably connected to the other end of the moving beam. It features. As a result, the rolling mechanism can be realized with a relatively simple configuration.

The component mounting apparatus according to claim 4 is the invention according to any one of claims 1 to 3, wherein the guide rail is formed in a plane parallel to the first direction and perpendicular to the second direction. It is characterized by extending in one direction. Thereby, the bending moment by the inertia force at the time of acceleration / deceleration of the moving beam can be acted on the slider of the guide mechanism in the direction of high moment load capacity, and the component life can be extended.

According to the present invention, one end of the moving beam is held by the guide mechanism and the other end is held by the rolling mechanism with the degree of freedom in the second direction. Thus, when the moving beam is stretched or bent due to the heating of the linear motor, Edo can absorb this. Accordingly, large bending moments can be prevented from being applied to the holding portions at both ends of the moving beam, thereby extending the life of components of the holding portions. Moreover, even if the bending deformation by heat generate | occur | produces in a moving beam, since this can be eliminated, deterioration of component mounting precision can be prevented.

1 is a plan view showing a component mounting apparatus in the present invention.
2 is a front view showing the Y linear motion mechanisms 30 and 40.
3 is a perspective view showing the Y linear motion mechanism 30.
4 is an exploded perspective view showing a rolling mechanism.
5 is a view showing a method of assembling a rolling mechanism.
6 is a view showing an assembled state of the Y linear motion mechanism 30.
7 is a front view illustrating the conventional Y linear motion mechanisms 110 and 120.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. 1 is a plan view showing a component mounting apparatus in the present invention. 1, the up-down direction is the Y direction (first direction), the left-right direction is the X direction (second direction), and the paper vertical direction is the Z direction. In the drawing, reference numeral 1 denotes a component mounting apparatus. The component mounting apparatus 1 is provided with a pair of conveyance rails 11 extending in the X direction on the upper surface of the device base 10. The conveyance rail 11 conveys the circuit board 5 in the X direction by being driven by a conveying motor (not shown) supporting both side portions of the circuit board 5.

In addition, the component mounting apparatus 1 includes a mounting head 12. The mounting head 12 is mounted to a moving beam 13 which extends in the X direction. As shown in Fig. 2, the mounting head 12 is a multi-type mounting head having a plurality of unit mounting heads 12a, and is provided by a suction nozzle 12b provided at the lower end of each unit mounting head 12a. Absorb and hold electronic components. As shown in FIG. 1, the frames 14a and 14b extending in the Y direction are provided at the left and right ends of the device base 10 in the X direction, respectively. Further, these frames 14a and 14b are provided with Y linear motion mechanisms 30 and 40 that can move along the frames 14a and 14b. These Y linear motion mechanisms 30 and 40 hold both ends of the movable beam 13 and move the movable beam 13 in the Y direction by driving the Y linear motion mechanisms 30 and 40.

In addition, the moving beam 13 has a built-in X linear motion mechanism (not shown) capable of moving along the moving beam 13. The mounting head 12 is held by the X linear motion mechanism, and the mounting head 12 is moved in the X direction by driving the X linear motion mechanism. In this way, the mounting head 12 is configured to be able to move horizontally on the device base 10 in the XY direction. The component mounting apparatus 1 is equipped with a component supply apparatus 15 for supplying electronic components by a tape feeder or the like on both sides of the conveyance rail 11 in the Y direction. The electronic component supplied from the component supply device 15 is vacuum sucked by the suction nozzle 12b of the mounting head 12 and mounted on the circuit board 5.

In addition, the component mounting apparatus 1 is provided with a nozzle exchanger 16 for replacing the suction nozzle 12b in accordance with the size and shape of the component to be sucked. In the nozzle exchanger 16, a plurality of types of nozzles are stored and managed. Furthermore, a component recognition camera 21 made of a CCD camera or the like is disposed between the component supply device 15 and the circuit board 5. The component recognition camera 21 is adsorbed with the adsorption nozzle to detect the adsorption position deviation of the electronic component, which is a deviation between the center position of the adsorption nozzle and the center position of the adsorption nozzle, or the adsorption angle variation indicating the inclination of the adsorption posture. It is to image an electronic component. In addition, the mounting head 12 is provided with a substrate recognition camera 22 made of a CCD camera or the like. The substrate recognition camera 22 moves integrally with the mounting head 12, and recognizes a mark indicating the position of the circuit board 5, not shown.

Next, the structure of Y linear motion mechanism 30 and 40 is demonstrated concretely. As shown in FIG. 2, the Y linear motion mechanism 30 includes a plate 31 fixed in a horizontal posture on the lower surface of the left end of the moving beam 13 in the X direction. The linear motor mover 32 is attached to the center of the lower surface of the plate 31, and the linear motor stator 33 is attached to the upper surface of the frame 14a so as to face the linear motor mover 32. As shown in FIG.

Moreover, on the lower surface of the plate 31, a pair of bearing guides 34 protrude in a plurality of sets on both sides in the X direction of the linear motor mover 32, respectively. These bearing guides 34 support the bearing 35. The inner ring of the bearing 35 is fixed to the bearing shaft 36 whose axis line coincides with the X direction, and both ends of the bearing shaft 36 are fixed to the bearing guide 34. That is, the inner ring of the bearing 35 is aligned with the X direction and fixed to the left end of the moving beam 13 in the X direction, and the outer ring of the bearing 35 is rotatable.

In this way, the Y linear motion mechanism 30 which keeps the left end of the moving beam 13 in the X direction so that it can move in the Y direction is aligned with the X direction and the left end of the moving beam 13 in the X direction of the moving beam 13. And a rolling mechanism that is rotatably connected. Moreover, the rolling mechanism is comprised by the pair of bearing guide 34, the bearing 35, and the bearing shaft 36. As shown in FIG. In this embodiment, as shown in FIG. 3, this rolling mechanism is provided in four corners of the lower surface of the plate 31. As shown in FIG.

4 is an exploded perspective view showing a rolling mechanism. The bearing 35 has an inner ring 35a, an outer ring 35b, and a plurality of unillustrated rolling elements rotatably mounted between the inner ring 35a and the outer ring 35b. . When the rolling mechanism is assembled to the plate 31, the bearing shaft 36 is first inserted into the inner ring 35a of the bearing 35 and fixed. Next, both ends of the bearing shaft 36 are fixed to the bearing guides 34, respectively. Thereby, the inner ring 35a of the bearing 35 is fixed to the bearing guide 34, and the outer ring 35b of the bearing 35 is rotatable. In this state, as shown in FIG. 5, the upper surface of the bearing guide 34 is fixed to the four corners of the lower surface of the plate 31 so that the axis line of the bearing shaft 36 may coincide with the X direction.

As shown in FIG. 6, the Y linear motion mechanism 30 is mounted on the frame 14a in the state which hold | maintained the left end of the moving frame 30 in the X direction. At this time, the outer peripheral surface of the outer ring 35b of the bearing 35 abuts on the upper surface of the frame 14a. Here, the contact surface with the outer ring 35b of the frame 14a is a flat surface, and the width of the X direction is set wider than the width of the outer ring 35b. That is, the left end of the moving beam 13 in the X direction is held by the rolling mechanism placed on the frame 14a so as to be slidable in the X direction.

With this configuration, when the linear motors 32 and 33 of the Y linear motion mechanism 30 are driven, the left end of the moving beam 13 in the X direction is Y in accordance with the rotation of the outer ring 35b of the bearing 35. Moveable in the direction. At the time of driving of the Y linear motion mechanism 30, the bearing 35 is framed by the suction force generated between the linear motor mover 32 and the linear motor stator 33 and the weight of the moving beam 13. It is in the state pushed against the upper surface of 14a). Accordingly, the Y linear motion mechanism 30 can stably move the moving beam 13 in the Y direction.

Returning to FIG. 2, the Y linear motion mechanism 40 which keeps the right end of the X direction of the movement beam 13 so that it can move to a Y direction is perpendicular to the side of the right end of the X direction of the movement beam 13 in the X direction. It has a plate 41 fixed with. The linear motor mover 42 is attached to the center of the outer side of the plate 41, and the linear motor stator 43 is mounted to the inner side of the frame 14b so as to face the linear motor mover 42. It is.

In addition, two sliders 44 are provided on the outer side surface of the plate 41 so as to sandwich the linear motor mover 42 at predetermined intervals in the vertical direction (Z direction). Two guide rails 45 extending along the Y-direction are provided on the inner side surface of the frame 14b, and the slider 44 is slidably fitted to the guide rails 45. In this way, the Y linear motion mechanism 40 which holds the right end of the moving beam 13 in the X direction so as to be movable in the Y direction is fixed to the device base 10 (frame 14b) and extends in the Y direction. And a guide mechanism composed of a guide rail 45 and a slider 44 slidably fitted to the guide rail 45 fixed to the right end in the X-direction of the moving beam 13.

As described above, the right end in the X direction of the moving beam 13 is guided to be movable in the Y direction by a guide mechanism composed of the slider 44 and the guide rail 45, and the X direction of the moving beam 13 is moved. The left end of the can be moved in the Y direction in accordance with the rotation of the outer ring 35b of the bearing 35 constituting the rolling mechanism. Therefore, when the linear motors of the Y linear motion mechanism 30 and the Y linear motion mechanism 40 are driven, the moving beam 13 moves smoothly in the Y direction. Moreover, the plate 41, the slider 44, and the guide rail 45 of the Y linear motion mechanism 40 correspond to the 1st holding part, and the plate 31 and bearing guide 34 of the Y linear motion mechanism 30 are also equivalent. , Bearing 35 and bearing shaft 36 correspond to the second retaining portion.

The linear motion mechanism using the linear motor like the Y linear motion mechanism 30 and 40 and the X linear motion mechanism of this embodiment is characterized by high speed operation and high positional accuracy, and the linear motor includes the mounting head 12 and the moving beam 13. Is driven to start and stop with high acceleration. When such driving is performed at a high frequency, the mover of the linear motor generates heat, and its heat is transferred to the moving beam 13. Then, the temperature of the moving beam 13 rises, and thermal deformation occurs in which the moving beam 13 expands or contracts in the X direction.

In the case where the moving beam is driven in the Y direction by the Y linear mechanism using the linear motor, both ends of the moving beam are generally held by guide mechanisms composed of sliders and guide rails, respectively. However, in the configuration in which both ends of the moving beam are held by the guide mechanism, since there is no degree of freedom in the X direction of the moving beam, when the moving beam expands and contracts in the X direction due to heat generation of the linear motor as described above, A large bending moment acts, resulting in a reduction in the life of the parts constituting the guide mechanism. In addition, if the electronic component mounting process is performed in a state where thermal deformation occurs in the moving beam, the component placement accuracy is deteriorated.

In contrast, in this embodiment, one end of the moving beam 13 is held by the guide mechanism, and the other end is held by the rolling mechanism placed on the frame 14a so as to be slidable in the X direction. Thereby, the freedom degree of the X direction can be provided to the moving beam 13. For this reason, when heat deformation generate | occur | produces in the moving beam 13 by the heat_generation | fever of the linear motor which comprises a linear motion mechanism, it can absorb this by sliding to a X direction of a rolling mechanism.

For example, when the moving beam 13 extends in the X direction due to thermal deformation, the bearing 35 slides on the frame 14a in the left direction in FIG. That is, the component parts of the Y linear motion mechanism 30 slide in the left direction in FIG. 2 as the moving beam 13 is extended. In contrast, when the moving beam 13 is reduced in the X direction due to thermal deformation, the bearing 35 slides on the frame 14a in the right direction in FIG. That is, the component parts of the Y linear motion mechanism 30 move to the right direction in FIG. 2 as the moving beam 13 decreases.

Therefore, when the moving beam 13 expands and contracts in the X direction, the rolling mechanism holding the left end of the moving beam 13 in the X direction and the guide mechanism holding the right end of the moving beam 13 in the X direction are large. The action of the bending moment can be suppressed. For this reason, the lifetime deterioration of the components of a rolling mechanism and a guide mechanism by acting the said bending moment can be prevented. As a result, as compared with the case where both ends are held by the guide mechanism, the durability of the holding part holding both ends of the moving beam 13 can be significantly improved. Furthermore, by giving the moving beam 13 a degree of freedom in the X direction, even if a bending deformation due to heat occurs in the moving beam 13, it can be eliminated, so that the component mounting process is performed in the state where the moving beam 13 is deformed. A situation can be avoided and the deterioration of the mounting precision of an electronic component can be prevented.

Further, the rolling mechanism is constituted by a bearing 35 in which the inner ring 35a coincides with the X direction and is fixed to the end of the moving beam 13, and the outer ring 35b is rotatable, whereby the bearing 35 is X. Since it is mounted on the frame 14a so as to be slid in the direction, it is possible to give the moving beam 13 a degree of freedom in the X direction with a relatively simple configuration. Furthermore, since one end of the moving beam 13 is held constrained by the guide mechanism composed of the slider and the guide rail, the displacement in the X direction according to the thermal deformation of the moving beam 13 is changed to the other of the moving beam 13. It can absorb suitably by the rolling mechanism which hold | maintains the edge part. In addition, since the guide rail constituting the guide mechanism extends in the Y direction in a plane parallel to the Y direction and perpendicular to the X direction, durability against the bending moment in the Y direction can be improved. For this reason, the lifetime of the parts which comprise a guide mechanism can be extended.

(Variation)

Moreover, in the said embodiment, although the case where the rolling mechanism using the bearing 35 was employ | adopted, the rolling mechanism using a cylindrical roller can also be employ | adopted. In this case, instead of the bearing 35 and the bearing shaft 36, a cylindrical roller may be used to rotatably connect the cylindrical roller whose axis coincides with the X direction to the bearing guide 34. Moreover, in the said embodiment, although the case where the linear motor is arrange | positioned at the both ends of the moving beam 13 was demonstrated, the structure arrange | positioned only in either one may be sufficient.

1: Component mounting device
5: Circuit Board
11: return rail
12: mounting head
12a: unit mounting head
12b: adsorption nozzle
13: moving beam
14a, 14b: frame
15: parts supply device
16: nozzle changer
21: parts recognition camera
22: substrate recognition camera
30: Y linear mechanism
31: Plate
32: linear motor mover
33: linear motor stator
34: bearing guide
35: bearing
36: bearing shaft
40: Y linear mechanism
41: plate
42: linear motor mover
43: Linear Motor Stator
44: slider
45: guide rail

Claims (4)

A mounting head having a suction nozzle for absorbing a component supplied from the component supply device and mounting the component at a predetermined position on the substrate;
The mounting head is mounted to move on the device base in a first direction, the movable beam extending in a second direction orthogonal to the first direction;
A linear motor for moving the moving beam in the first direction;
A first holding part for holding one end of the moving beam to be movable in the first direction with respect to the device base;
A second holding part for holding the other end of the moving beam to be movable in the first direction with respect to the device base;
A component mounting apparatus having a
The first holding part includes a guide rail fixed to the device base and extending in the first direction, and having a slider fixed to one end of the moving beam and slidably fitted to the guide rail. Is composed by
The second holding part is constituted by a rolling mechanism mounted on the device base so as to be axially connected to the other end of the moving beam in coincidence with the second direction and to be slidable in the second direction. Component mounting apparatus, characterized in that. The method of claim 1,
The rolling mechanism is a component mounting apparatus characterized in that the inner ring is fixed to the other end of the moving beam with the axis coinciding with the second direction, and the outer ring is constituted by a rolling bearing which is rotatable. The method of claim 1,
And said rolling mechanism is constituted by a cylindrical roller which is axially aligned with said second direction and rotatably connected to the other end of said moving beam. 4. The method according to any one of claims 1 to 3,
And the guide rail extends in the first direction in a plane parallel to the first direction and perpendicular to the second direction.

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